Metal lath



' Nvf`6, 1928.

J. H. KILLION ed Sept. 1'7, 1926 Patented Nov. 6, 1928.

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i l.reina n. intron, '0F CHICAGO, rnriiriis.4

i MTAL LATH,

y aberration*ineusiltentr 17, vieee. Ysriaritbviaeiis ltlyinventon relates to improvements tln metal lath, and'itzcdnsists in the combinations,` constructidnsfad arrangements rherein describedl and claimed.

An object oflniyihventioh ifs to prvidea metal lath which is'so c'onstructedthat there is a minimun waste'of'plaster.

A further object of the invention is to provide a metal lath which is so constructed. that even though the sheet is lighter in weight than the ordinary metal lath, 1t 1s stronger and will resist bending and pressure to a greater extent than the ordinary metal lath.

A further object is to provide a metal lath which can be readily manufactured by means of rolls instead of by reciprocating dies, thus further decreasing the cost of manufacture.

A further object is to provide a metal lath so constructed that the teeth or dies which cut the lath leave it in such a condition that the teeth lnay be readily withdrawn, thus permitting devices like rolls to be used and speeding up production.

Other objects and advantages will appear in the following specification, and the novel features of the invent-ion will be particularly pointed out in the appended claims.

' My invention is illustrated in the accompanying drawings, forming part of this application, in which Figure l is a face view of a section of lath constructed according to my invention,

Figure 2 is a section along the line 2-2 of Figure 1,

Figure 3 is a section through one of the ribs Figure 4 is a section substantially along the line 4-4 of Figure 2 with the plaster in place, and

Figure 5 is a fragmentary portion of a modified form of the device.

In carrying out my invention, I provide a thin metal sheet l which has stampedthereon a series of parallelridges 2 on one side t0 form parallel grooves 3 on the opposite side.

Arranged in parallelism between the grooves or ridges 1s a series 0f ribs. Alternate ribs 4 are bowed out on that side of the sheet bearing the grooves 3, while the inter mediate ribs 5 are bowed outwardly on', that side of the sheet bearing the ridges 2.

In addition to being bowed outwardly, each rib is grooved inwardly in a lateral direction,as"sl1owi1` in Figure 3 at 4a 'and also in' Fiore 4. Y

iii 'ier-ming mei-ibs in this amener, it will be noted that the 'metal of each rib must necessarily be "drawirfn at thesideedges soV that this leaves `a small space or slit 6 between tlieedges of one rib and the nearest edges of the two ribs on either side thereof which are bowed in the Opposite direction. The provision of Athis slight opening is of great importance in the manufacture of the lath. l

From the foregoing description of the various parts of the device, the operation thereof may be readilyunderstood. As will be seen from iigure 4, the space between' adjacent ribs 4 has immediately behind it a rib 5, so that when the plaster is -applied the rib 5 tends to cause the plaster to spread out behind the ribs 4 so as to securely lock the plaster in position, while very little if any plaster will be forced between adjacent ribs 5. The result is that very little, if any, of the plaster will fall off from the rear portion of the lath, but the space between two sheets of oppositely bowed ribs will be completely filled with the paster, and it will require a minimum of plaster to ill it.

While I have shown the plaster as applied to that face of the sheet having the outwardly bowed ribs 4, it is obvious that it might be applied from the opposite side with equally good effects, since the same conditions are met, that is to say, that a rib 4 will register with the space between the ribs 5 so as to spread out the mortar in the same manner.

The bowed shape of the ribs tends to add strength in one direction, while the curvature of the ribs in a direction at right angles tends to add additional strength to each rib. The result is a very strong lath from a relatively thin piece of metal.

The lath is attached to the studding 7 by means of nails 8 which are placed in the grooves 3 and driven into the studding. It is of course easier to apply the lath by nails which are placed in the grooves, since the grooves tend to center the nails and to permit the quick attachment of the lath.

In Figure 5 I have shown a modified form of the invention in which the ribs 4a alternate with ribs 5 which are disposed at an acute angle with respect to the groove 3a, so

that when the lath is secured in a horizontal slits, the metal between adjacent slits constil tiltingy ribs, alternatelribsbeing bowed outwardly from the face of one side of the sheet and the remaining -rlbs being bowed outwardly from the face of the other side of the sheet, and'all of said ribs being stamped to provide a trough on the buter convex surface kof the rib, and a curved ridge en the inner surface whereby the original width of the rib is decreased. n

2. A metal lath construction comprising a metal sheet having a Vplurality of rows of parallelslits, the metal between adjacent slits constituting ribs, alternate ribs being bowed outwardly from the face of one side of the sheet and the remaining ribs being bowed outwardly from the face of the other side of the sheetand all of said ribs being stamped to provide ia trough onl the outer convex surfacebf the rib, and a ,curved ridge on the inner surface whereby the `original width of the rib is decreaserhwthat portion of the metal between adjacent parallel rows being stamped to provide a groove on one side of the sheet and a ridgeon the opposite side.` i i JOHN H. KILLION. 

